Diffusion kinetics in binary CuZr and NiZr alloys in the super-cooled liquid and glass states studied by nanocalorimetry

SCRIPTA MATERIALIA

卷:165

Article

Lee, Dongwoo¹  Vlassak, Joost J.² 

[1] Sungkyunkwan Univ, Sch Mech Engn, Suwon 16419, Gyeonggi Do, South Korea

[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

关键词: Metallic glass;    Diffusion;    Solid state;    Super-cooled liquid;    Nanocalorimetry;   

DOI  :  10.1016/j.scriptamat.2019.02.014

来源: Elsevier

【 摘 要 】

In this work, we use nanocalorimetry to characterize the diffusion kinetics of Cu-Zr and Ni-Zr glass-forming alloys in both the solid state and the super-cooled liquid state, covering a temperature range from 0.67T(g) to 1.49T(g). We find that diffusion in the solid state follows Arrhenius behavior, while the kinetics in the super-cooled liquid state is well described by a fragility-based model that takes into account breakdown of the Stokes-Einstein relationship between the diffusivity and viscosity. The current work uses a single experimental technique to map out the kinetics of diffusion over a broad temperature range in both states. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free